1.1 Ear simulators are intended for earphone response determination, measurement of hearing aid
gain and performance, and measurements requiring
simulation of the sound transmission characteristics of an external ear. They provide data equivalent to sound pressures at the eardrum generated by various sources in and around the ear. A schematic or conceptual representation of a complete ear simulator is given in Fig. 1.
1.2 The occluded ear simulator described in this
standard is that portion below the line X-X’ in the
schematic representation of a conceptual ear simulator in Fig. 1.
1.3 This standard gives physical performance criteria for a mechanical structure that provides acoustic impedance and exhibits sound-pressure distributions approximating those found in a median adult human ear between an earmold and the eardrum. It also describes a specific device whose performance conforms to these criteria.
1.4 As a simulation of part of a median adult human
ear, the occluded ear simulator is suitable for use
in calibration systems such as manikins, where the
complete ear is to be simulated.
1.5 Procedures are outlined for determining that the
occluded ear simulator has the acoustic performance
specified in this standard.
1.6 Appendix A presents an acoustsic performance
comparison of the ANSI occluded ear simulator with
the IEC 71 1 ( 1982) occluded ear simulator.